Camera attachment



July 25, 1933. R KEOGH 1,919,635

CAMERA ATTACHMENT Filed May 16, 1952 MM @L IN VENTOR.

ATTORNEYS bulb 9, by means of wires 10 and 11. The

Patented July 25, 1933 UNITED STATES ROBERT KEOGH, 0F HOLLIS, NEW YORK,ASSIGNOR T0 STAR COMPANY, OF NEW YORK,

N. Y'., A CORPORATION OF NEW YORK CAMERA ATTACHMENT Application filedMay 16,

My invention relates to a new and improved camera attachment.

' One of the objects of my invention is to .provide a camera attachmentfor operating the shutter of a camera.

Another object of my invention is to provide a camera attachment foroperating the shutter of a camera at the proper time, when a flashlightbulb is utilized.

Another object of my invention is to provide a camera attachment of: asimple and compact type, which can be readily applied to a camera, inorder to provide a direct means for operating the shutter of the camera.

Other objects of my. invention will be specified the followingdescription and drawing, which illustrates a preferred embodimentthereof, it being understood that the above statement of the objects ofmy invention is intended to generally explain the same without limitingit in any manner.

Heretofore the operation of the shutter of a camera when a flashlightbulb was utilized, has been very inaccurate. The operator was compelledto guess the proper. moment for operating the shutter of the camera.When a flashlight bulb has its circuit closed, a short time necessarilyelapses befor the flashlight bulb is suificiently heated in order tooperate. If the photographer operated the shutter of the camera at thewrong time, the flashlight bulb was of little or no use.

According to my invention, an electrical control is provided foroperating the shutter of the camera at the proper-moment.

The drawing illustrates a diagrammatic view of the device herein.

Referring to the drawing, the battery 1 is connected to the terminals ofthe flashlight circuit is controlled by means of a handswitch 2. Anelectromagnet 4 is connected in shunt to the battery 1, by means of thewires 11 and 12. The shunt circuit of which the electromagnet 4.for ms apart, may include an adjustable resistance 3 and the circuit of theelectromagnet is also controlled by switch 2.

The electromagnet 4 is provided with an armature 6 which pivotallymounted at 7.

. sent through the electromagnet 4. The re- 1932. Serial No. 611,456.

A spring 5 may be provided for holding the armature 6 away from the coreof the electromagnet4. The armature 6 abuts the trigger 8 of the cameraC so that when the armature 6 is turned in the clockwise direction, itoperates the trigger 8 and thus releases the shutter of the camera 0.

The parts (including the battery) may be mounted upon a suitable base15, which may be suitably connected to the wall of the camera.

In order to operate the device, it is merely necessary to close theswitch 2. When the flashlight bulb 9 is cold, its filament has a lowresistance. The major portion of the current is therefore sent throughthe bulb 9, while the armature 6 remains inoperative becauseinsufiicient current is sent through the electromagnet 4, to operate thearmature 6 against the force of the spring 5. The spring 7 5 may beunder any desired tension, and this tension may be adjustable by meansof any well known device. Likewise, astop may be utilized for preventingthe armature 6 from moving out of abutting relationship with the 75trigger 8. The flashlight bulb 9 is of the well known type, so that itrequires no specific description. As the filament of the flashlight bulb9 is heated by the passage of current through the same, the resistanceof said bulb 9 increases. Since the flashlight bulb 9 is of the usualvacuum type, the heat which is produced in the filament by the passageof the current is radiated very slightly so that the temperature of saidfilament and the resistance thereof is rapidly and uniformly increased,until the temperature of the filament is sufliciently high to ignite theflashlight material. This causes more current'to be sistance 3 and theresistance of the electromagnet 4 (together with the inductance of theelectromagnet 4) can be properly selected so that the shutter isoperated to provide i111 Iexposure when the bulb 9 flashes or emitsxperience has shown that it is simple to properly adjust the resistanceof the various parts so that the bulb 9 is caused to emit its light atthe proper moment, so as to secure a also connected to said source ofcurrent, said flashlight bulb and said electromagnet being energized incircuits, parallel to each other, by said source of current and havingtheir circuits controlled by. a common switch, said electromagnet havingan armature Whose movement is adapted to control the operation of theshutter of the camera, the circuit of said electromagnet having animpedance which causes said shutter to be operated immediately beforethe incandescence of the flashlight filament reaches the flashing point,the circuit of said electromagnet including a variable resistance.

ROBERT KEOGH.

